LNF Scientific Committee, October 28th 1 Paola Gianotti LNF.

1LNF Scientific Committee, October 28th

Paola Gianotti

LNF


Outlook

Where we are since last committee…• Detector installation progress• Detector debug• Targets preparation• Online software/hardware upgrades • Online luminosity monitor • Micro-strips alignment procedure

Where we plan to arrive till next committee…• Magnet work in progress• Central detectors installation plans• Detector debug • Cosmic rays tests

Where we are since last committee…• Detector installation progress• Detector debug• Targets preparation• Online software/hardware upgrades • Online luminosity monitor • Micro-strips alignment procedure

Where we plan to arrive till next committee…• Magnet work in progress• Central detectors installation plans• Detector debug • Cosmic rays tests


Where we were…

During last committee (May 18th) the mechanical frame that houses FINUDA detectors, “CLESSIDRA”, was brought into the DANE hall

To gain some time on the schedule the “CLESSIDRA” was also inserted inside the magnet (May 19th)


Work done during the August shutdown (30/73/9)

“Clessidra” alignment inside the magnet Piping and cabling detectors-FEE racks (ST, outer LMDC, TOFONE)

Detector checkout & debug started (ST, outer LMDC, TOFONE)

Begin of He-bag piping Slow control & safety systems installation TRIGGER cabling & debug New DAQ installation & debug


1. “Clessidra” has been aligned to the iron yoke to be planar (x-z plane horizontal) 2. The axis has been aligned to that of the cryostat.3. The center of the “Clessidra” has been moved along z to be centered to have the same

distance from the 2 end-caps

The precision obtained on the x-z plane is 0.01degreesThe precision obtained on the z axis alignement is 0.5 mm

“Clessidra” has been aligned using a laser tracker (Leica LTD500)


e side

e side


New DAQ system

CPU

Corbo

VIC8250

GTSGTS

CPU

Corbo

VIC8250

TOFTOF

CPU

Corbo

VIC8250

LMDLMD

CPU

Corbo

VIC8250

STBSTB

CPU

Corbo

VIC8250

ISIMISIM

OSIMOSIMPVICdiff BUS for data stream

Run Control + GEB+ Storage

VMEcrates

Ethernet for command transmission and event monitoring C

PU

Corbo

VIC8250

PVICoptical connectionfor data stream

COUNTING ROOM

DAFNE HALL


Monitoring scheme

Run Control PC

Global monitorEvent Display

Single detectormonitor

Slow Control


Performance of the new DAQ system

Active Detectors: TOF GTS Tot. buffer size: 1 kBTrigger rate DAQ rate MB/s [Hz] [Hz] 350 346 0.4 400 394 0.4 450 400 0.4




Active Detectors: TOF GTS LMD STBTot. buffer size: 4 kBTrigger rate DAQ rate MB/s [Hz] [Hz] 100 106 0.4 200 200 0.7 300 200 0.7

Active Detectors: TOF GTS LMD STBTot. buffer size: 4 kBTrigger rate DAQ rate MB/s [Hz] [Hz] 100 106 0.4 200 200 0.7 300 200 0.7


Online luminosity monitor I

With MC studies we have defined the Bhabha events topology:• imult: ITOF mult = 2; • back: back-to-back ITOF topology ;• emult: ETOF mult 2 4; • energy: small E inside ITOF;• tof: t betweeen ETOF and ITOF 4.5 6.5 ns;

x

y

10 cm

cut Bhabha K+ K K s K l Touscheknone 1000 1000 1000 100000imult 981 523 368 2327back 864 306 84 2emult 739 171 60 0tof 739 138 55 0energy 739 18 55 0acceptance 0.739 0.018 0.055 < 1.9 ·10 -7


Online luminosity monitor II

Bhabha = 810 nb for 45o<<135o

MC Bhabha trigger efficiency ~ 0.74@ L= 5·1031 Bhabha trigger rate ~ 30Hz

If Bhabha reconstruction efficiency 1~ 15’ to to give L value @ 1%

Bhabha = 810 nb for 45o<<135o

MC Bhabha trigger efficiency ~ 0.74@ L= 5·1031 Bhabha trigger rate ~ 30Hz

If Bhabha reconstruction efficiency 1~ 15’ to to give L value @ 1%

As a cross check we can also obtain luminosity and energy values counting KK pairs


Work done during October shutdown (15/1021/10)

Test of end-caps closure Installation -strips FEE Start of central detector cables spreading upon the magnet~2/3 He-bag piping going on Detector checkout & debug going on (ST, outer LMDC, TOFONE)

TOF laser installation DAQ tests


Targets design

Vanadium target profile

Aluminum target profile

Carbon target profile

Lithium target profiles

Silicon target profile

200.00

44.10210.0044.10

26.0

1.7

0

0.0

3

4.7

0

0.0

3

244.00

244.00

27.10

3.7

0

2.6

02

.60

4.1

027.10

27.10

27.10

4.7

0

1.0

0

4.7

0

0.6

0

192.9652.62 52.62

2.6

0

4.1

0

0.0

3

1.4

0

0.0

3

182.960.033

.32

50

.03

2.6

0

210.00

200.00

44.1044.10

0.6

25

2.6

0

210.00

200.00

1.0

0

44.1044.10

3.7

0

.03

To decide which targets willbe mounted for the first datataking, we are organizing a Workshop March 20/22 2002together with the major theoretical experts (A. Gal, A.Ramos,…)http://fidabs.ing.unibs.it/WHPD/

To decide which targets willbe mounted for the first datataking, we are organizing a Workshop March 20/22 2002together with the major theoretical experts (A. Gal, A.Ramos,…)http://fidabs.ing.unibs.it/WHPD/


SpectroscopizedSpectroscopized

Li K 6-

He n n 4

06 He

-6 Li H6

Spectroscopized in coincidence

First case ofexclusive NM

decay: a few/pb-1

Why a 6Li target?


Spectroscopized-6 Li

p He5

d+d spectr. (1/pb-1 if B.R. 10-3)

p+ 3H spectr.(0.5/ pb-1 if B.R. 10-3) ++n+3H many events ( 102/pb-1)how distinguishable?

about 102/pb-1

n p He4

p(incoinc.) about 10/pb-1

n(incoinc.) a few/pb-1

p p H4 4He+ + spectr. (102/pb-1) calibration


7Li target prototype 4mm thickness7Li target prototype 4mm thickness

Lithium is enclose in a 110 m thickness foil consisting of 3 layers: polypropylene+aluminum+polyester

Lithium is enclose in a 110 m thickness foil consisting of 3 layers: polypropylene+aluminum+polyester


Lithium target mounted on the mechanical supportLithium target mounted on the mechanical support


7Li target prepared as manufacturing test for the final 6Li target 7Li target prepared as manufacturing test for the final 6Li target

Drawn Li target

Target obtained with melting


Melted Lithium inside the oven. Due to the high surfacetension Lithium is not filling all the melting pot

Melted Lithium inside the oven. Due to the high surfacetension Lithium is not filling all the melting pot


A Lithium block obtained by melting is then drawnA Lithium block obtained by melting is then drawn


Preliminary analysis:• 1 telescope of 4 modules• aligned with the “3D residual vectors” method• convergence of parameters by using a sequential and iterative technique. Present analysis made for a stack of 4 modules, 6x4 parameters to be minimized • check the distributions of residuals

Aims:• work out an alignment strategy for the double-sided silicon detector (VDET)• test the VDET response while working at nominal conditions

Aims:• work out an alignment strategy for the double-sided silicon detector (VDET)• test the VDET response while working at nominal conditions

VERTEX DETECTORAlignment procedure using cosmic data

Data:• collected ~106

“good” events• VDET continuously working for ~3 months• used 18 modules cooled @ (18º±2º)C• VDET in the ASTRA clean room @ 21º-25ºC


Layout of the FINUDA central region

2

osim

isim

target

tofino

beam pipe

telescope used in the present analysis

reconstructed cosmic ray

34

1

1 cm

8

7

6 5

d

23LNF Scientific Committee, October 28thndf = # events - # paramndf = # events - # param

d = - 426 µm

= - 2.3 mrad = - 0.3 mrad

r = 126 µm

z = 45 µm

= - 0.2 mrad

1st s

tep

Position of # 1 after the 1st step

Translation parameter: DdTranslation parameter: Dd Translation parameter: DzTranslation parameter: DzTranslation parameter: DrTranslation parameter: Dr

Rotation parameter: 0rRotation parameter: 0r Rotation parameter: 0dRotation parameter: 0d Rotation parameter: 0zRotation parameter: 0z


2nd

step

d = 2.6 µm z = - 1.4 µm

r = 105 µm

= 0.1 mrad = - 0.2 mrad

= - 0.2 mrad

ndf = # events - # paramndf = # events - # param

… final step

Translation parameter: DdTranslation parameter: Dd Translation parameter: DzTranslation parameter: DzTranslation parameter: DrTranslation parameter: Dr

Rotation parameter: 0rRotation parameter: 0r Rotation parameter: 0dRotation parameter: 0d Rotation parameter: 0zRotation parameter: 0z


Results:

• int : pitch/12 =

• <> = 2int + mscat + 2

sag

… to be analyzed and corrected

• average efficiency (1234/123)

of a single module > 97% in the

active region

<Z> = 59.9 0.6µm

Assessed time scale:

~ 20.000 tracks required ~ 4 Hz of cosmic ray crossing TOFINOrate of 5678 tracks / all tracks ~ 0.005 ~2 weeks of cosmic rays data taking

d [um]

z ~ 30 µm

d ~ 15 µm

<d > = 36.9 0.3µmStand. dev. of residues along dStand. dev. of residues along d

Stand. dev. of residues along ZStand. dev. of residues along Z


Work plans for January shutdown (02/0217/02?)

Reconnection of the magnet to the Cryogenic lineMagnet cooling down (~12 days after Kloe cooling)ITOF mounting & test; installation of few microstrips Inner LMDC insertionHe Bag installation going onEnd-caps closureMagnet switching on

Finuda foresees about 6 weeks of DAFNE shutdown starting from January 2nd


January shutdown details I


January shutdown details II


Conclusions

Up to now FINUDA installation is going on without particular problems. Good cooperation with A.D.

Detectors installation & debug is our priority, but we are also preparing all the tools for running (targets, DAQ, Monitors, alignment procedure…)

We are working in connection with the best theoreticians of the field to select the best set of targets [http://fidabs.ing.unibs.it/WHPD/ ]

Cosmic rays tests are foreseen starting from March Detector will be ready for roll-in by summer 2002

LNF Scientific Committee, October 28th 1 Paola Gianotti LNF.

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